wmhttp 0.3.1

a http server for rust
Documentation 
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// Copyright 2022 - 2023 Wenmeng See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//
// Author: tickbh
// -----
// Created Date: 2023/09/14 09:42:25

use std::io;
use std::pin::Pin;
use std::task::{ready, Poll};

use algorithm::buf::{BinaryMut, BinaryRef, Bt};
use bytes::{BufMut, BytesMut};
use tokio::io::AsyncRead;
use tokio_stream::Stream;
use tokio_util::codec::FramedRead as InnerFramedRead;

use webparse::{
    ws::{DataFrame, OwnedMessage},
    WebError,
};

use crate::ProtResult;

#[derive(Debug)]
struct MyCodec(bool);

impl tokio_util::codec::Decoder for MyCodec {
    // ...
    type Item = DataFrame;
    type Error = WebError;
    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
        use bytes::Buf;
        let (frame, size) = {
            let mut copy = BinaryRef::from(src.chunk());
            let now_len = copy.remaining();
            let frame = match DataFrame::read_dataframe_with_limit(&mut copy, !self.0, 100000) {
                Ok(frame) => frame,
                Err(WebError::Io(io)) if io.kind() == io::ErrorKind::UnexpectedEof => {
                    return Ok(None);
                }
                Err(e) => {
                    log::trace!("io error = {:?}", e);
                    return Err(e);
                }
            };
            (frame, now_len - copy.remaining())
        };
        src.advance(size);
        return Ok(Some(frame));
    }
}

#[derive(Debug)]
pub struct FramedRead<T> {
    inner: InnerFramedRead<T, MyCodec>,
    caches: Vec<DataFrame>,
}

impl<T> FramedRead<T> {
    pub fn get_mut(&mut self) -> &mut T {
        self.inner.get_mut()
    }

    pub fn get_ref(&self) -> &T {
        self.inner.get_ref()
    }
}

impl<T> FramedRead<T>
where
    T: AsyncRead + Unpin,
{
    pub fn new(io: T, is_client: bool) -> FramedRead<T> {
        FramedRead {
            inner: InnerFramedRead::new(io, MyCodec(is_client)),
            caches: vec![],
        }
    }

    pub fn into_io(self) -> T {
        self.inner.into_inner()
    }

    pub fn set_cache_buf(&mut self, read_buf: BinaryMut) {
        self.inner.read_buffer_mut().put_slice(read_buf.chunk());
    }
}

impl<T> AsyncRead for FramedRead<T>
where
    T: AsyncRead + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
        buf: &mut tokio::io::ReadBuf<'_>,
    ) -> Poll<std::io::Result<()>> {
        use bytes::Buf;
        if self.inner.read_buffer_mut().remaining() > 0 {
            let read = std::cmp::min(buf.remaining(), self.inner.read_buffer_mut().remaining());
            buf.put_slice(&self.inner.read_buffer_mut().chunk()[..read]);
            self.inner.read_buffer_mut().advance(read);
            return Poll::Ready(Ok(()));
        }
        Pin::new(self.get_mut().get_mut()).poll_read(cx, buf)
    }
}

impl<T> Stream for FramedRead<T>
where
    T: AsyncRead + Unpin,
{
    type Item = ProtResult<OwnedMessage>;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        loop {
            let bytes = match ready!(Pin::new(&mut self.inner).poll_next(cx)) {
                Some(Ok(bytes)) => bytes,
                Some(Err(WebError::Io(io))) if io.kind() == io::ErrorKind::UnexpectedEof => {
                    println!("is UnexpectedEof");
                    return Poll::Pending;
                }
                Some(Err(e)) => return Poll::Ready(Some(Err(e.into()))),
                None => {
                    return Poll::Ready(None);
                }
            };

            let is_finish = bytes.finished;
            self.caches.push(bytes);
            if is_finish {
                let msg = OwnedMessage::from_dataframes(self.caches.drain(..).collect())?;
                return Poll::Ready(Some(Ok(msg)));
            } else {
                return Poll::Pending;
            }
        }
    }
}